Help with unresponsive board
strohm81 last edited by strohm81
I am helping my high school robotics team build a new printer with a Duet 2 Ethernet and expansion board to drive Clearpath servos. We had everything hooked up and configured and were ready to run a test print when during bed leveling a dial indicator showed there was a dip in the middle of the bed. We acquired a genuine BLtouch off Amazon and installed it according to the wiki with the input pins in the dedicated inputs next to the expansion header and the +5, gnd,and pwm pins on heater 7 of the expansion board.
After powering up to configure the probe we were unable to connect to the board via ethernet and only the blue LED was lit on the board. Unplugging the probe wiring had no effect. After unplugging the printer and connecting a usb cable the 5v, 3.3v, and diag LEDs were flashing but we were unable to establish connection.
After searching the forums U3 regulator failure kept coming up as a potential culprit and it appears that U3 on our board is damaged though nothing we found indicated why this might have happened. The board was purchased for the project more than 6 months ago but was just now being commissioned. Any help and insight on how to prevent this from happening again would be appreciated. Thanks in advance.
@strohm81 Almost certainly the BLTouch was wired incorrectly. Most likely the 5V was shorted to ground, and U3 (the 5V regulator) failed because of this. If you can post a well lit, high resolution image of the board, it may be possible to check if there is any other damage.
If you are able to replace U3 (see https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Voltage_regulators_1 for part number), the board should work again. If you cannot repair it yourself, someone in the Duet community may be able to repair it for you: https://forum.duet3d.com/topic/13875/community-repairs
It should also work powered by an external 5V source, see https://duet3d.dozuki.com/Wiki/Power_Wiring#Section_5V_power
To thoroughly troubleshoot the board, see https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond
If you can't connect via USB, it may be the firmware has been erased, so try flashing fresh firmware.
If none of this works, please contact info@duet3D.com and we may be able to supply you with a refurbished Duet at reduced cost.
Thanks, we have 5v available so I will try using an external source with fresh firmware.
When and where was the Duet purchased?
@phaedrux it was bought it from Filastruder, I'll see if the order info can be tracked down but it was at least a couple years ago.
The board was purchased for the project more than 6 months ago but was just now being commissioned.
it was bought it from Filastruder, I'll see if the order info can be tracked down but it was at least a couple years ago.
I guess a couple years is technically more than 6 months.
@phaedrux it's not ideal but the robots always took priority; if there was any silver lining in the past year we finally had capacity to get to other things that had been languishing
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